
/** 
* DES加密解密 
* @Copyright Copyright (c) 2006 
* @author Guapo 
* @see DESCore 
*/

/* 
* encrypt the string to string made up of hex 
* return the encrypted string 
*/
function strEnc(data, firstKey, secondKey, thirdKey) {

  var leng = data.length;
  var encData = "";
  var firstKeyBt, secondKeyBt, thirdKeyBt, firstLength, secondLength, thirdLength;
  if (firstKey != null && firstKey != "") {
    firstKeyBt = getKeyBytes(firstKey);
    firstLength = firstKeyBt.length;
  }
  if (secondKey != null && secondKey != "") {
    secondKeyBt = getKeyBytes(secondKey);
    secondLength = secondKeyBt.length;
  }
  if (thirdKey != null && thirdKey != "") {
    thirdKeyBt = getKeyBytes(thirdKey);
    thirdLength = thirdKeyBt.length;
  }

  if (leng > 0) {
    if (leng < 4) {
      var bt = strToBt(data);
      var encByte;
      if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
        var tempBt;
        var x, y, z;
        tempBt = bt;
        for (x = 0; x < firstLength; x++) {
          tempBt = enc(tempBt, firstKeyBt[x]);
        }
        for (y = 0; y < secondLength; y++) {
          tempBt = enc(tempBt, secondKeyBt[y]);
        }
        for (z = 0; z < thirdLength; z++) {
          tempBt = enc(tempBt, thirdKeyBt[z]);
        }
        encByte = tempBt;
      } else {
        if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
          var tempBt;
          var x, y;
          tempBt = bt;
          for (x = 0; x < firstLength; x++) {
            tempBt = enc(tempBt, firstKeyBt[x]);
          }
          for (y = 0; y < secondLength; y++) {
            tempBt = enc(tempBt, secondKeyBt[y]);
          }
          encByte = tempBt;
        } else {
          if (firstKey != null && firstKey != "") {
            var tempBt;
            var x = 0;
            tempBt = bt;
            for (x = 0; x < firstLength; x++) {
              tempBt = enc(tempBt, firstKeyBt[x]);
            }
            encByte = tempBt;
          }
        }
      }
      encData = bt64ToHex(encByte);
    } else {
      var iterator = parseInt(leng / 4);
      var remainder = leng % 4;
      var i = 0;
      for (i = 0; i < iterator; i++) {
        var tempData = data.substring(i * 4 + 0, i * 4 + 4);
        var tempByte = strToBt(tempData);
        var encByte;
        if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
          var tempBt;
          var x, y, z;
          tempBt = tempByte;
          for (x = 0; x < firstLength; x++) {
            tempBt = enc(tempBt, firstKeyBt[x]);
          }
          for (y = 0; y < secondLength; y++) {
            tempBt = enc(tempBt, secondKeyBt[y]);
          }
          for (z = 0; z < thirdLength; z++) {
            tempBt = enc(tempBt, thirdKeyBt[z]);
          }
          encByte = tempBt;
        } else {
          if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
            var tempBt;
            var x, y;
            tempBt = tempByte;
            for (x = 0; x < firstLength; x++) {
              tempBt = enc(tempBt, firstKeyBt[x]);
            }
            for (y = 0; y < secondLength; y++) {
              tempBt = enc(tempBt, secondKeyBt[y]);
            }
            encByte = tempBt;
          } else {
            if (firstKey != null && firstKey != "") {
              var tempBt;
              var x;
              tempBt = tempByte;
              for (x = 0; x < firstLength; x++) {
                tempBt = enc(tempBt, firstKeyBt[x]);
              }
              encByte = tempBt;
            }
          }
        }
        encData += bt64ToHex(encByte);
      }
      if (remainder > 0) {
        var remainderData = data.substring(iterator * 4 + 0, leng);
        var tempByte = strToBt(remainderData);
        var encByte;
        if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
          var tempBt;
          var x, y, z;
          tempBt = tempByte;
          for (x = 0; x < firstLength; x++) {
            tempBt = enc(tempBt, firstKeyBt[x]);
          }
          for (y = 0; y < secondLength; y++) {
            tempBt = enc(tempBt, secondKeyBt[y]);
          }
          for (z = 0; z < thirdLength; z++) {
            tempBt = enc(tempBt, thirdKeyBt[z]);
          }
          encByte = tempBt;
        } else {
          if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
            var tempBt;
            var x, y;
            tempBt = tempByte;
            for (x = 0; x < firstLength; x++) {
              tempBt = enc(tempBt, firstKeyBt[x]);
            }
            for (y = 0; y < secondLength; y++) {
              tempBt = enc(tempBt, secondKeyBt[y]);
            }
            encByte = tempBt;
          } else {
            if (firstKey != null && firstKey != "") {
              var tempBt;
              var x;
              tempBt = tempByte;
              for (x = 0; x < firstLength; x++) {
                tempBt = enc(tempBt, firstKeyBt[x]);
              }
              encByte = tempBt;
            }
          }
        }
        encData += bt64ToHex(encByte);
      }
    }
  }
  return encData;
}

/* 
* decrypt the encrypted string to the original string  
* 
* return  the original string   
*/
function strDec(data, firstKey, secondKey, thirdKey) {
  var leng = data.length;
  var decStr = "";
  var firstKeyBt, secondKeyBt, thirdKeyBt, firstLength, secondLength, thirdLength;
  if (firstKey != null && firstKey != "") {
    firstKeyBt = getKeyBytes(firstKey);
    firstLength = firstKeyBt.length;
  }
  if (secondKey != null && secondKey != "") {
    secondKeyBt = getKeyBytes(secondKey);
    secondLength = secondKeyBt.length;
  }
  if (thirdKey != null && thirdKey != "") {
    thirdKeyBt = getKeyBytes(thirdKey);
    thirdLength = thirdKeyBt.length;
  }

  var iterator = parseInt(leng / 16);
  var i = 0;
  for (i = 0; i < iterator; i++) {
    var tempData = data.substring(i * 16 + 0, i * 16 + 16);
    var strByte = hexToBt64(tempData);
    var intByte = new Array(64);
    var j = 0;
    for (j = 0; j < 64; j++) {
      intByte[j] = parseInt(strByte.substring(j, j + 1));
    }
    var decByte;
    if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
      var tempBt;
      var x, y, z;
      tempBt = intByte;
      for (x = thirdLength - 1; x >= 0; x--) {
        tempBt = dec(tempBt, thirdKeyBt[x]);
      }
      for (y = secondLength - 1; y >= 0; y--) {
        tempBt = dec(tempBt, secondKeyBt[y]);
      }
      for (z = firstLength - 1; z >= 0; z--) {
        tempBt = dec(tempBt, firstKeyBt[z]);
      }
      decByte = tempBt;
    } else {
      if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
        var tempBt;
        var x, y, z;
        tempBt = intByte;
        for (x = secondLength - 1; x >= 0; x--) {
          tempBt = dec(tempBt, secondKeyBt[x]);
        }
        for (y = firstLength - 1; y >= 0; y--) {
          tempBt = dec(tempBt, firstKeyBt[y]);
        }
        decByte = tempBt;
      } else {
        if (firstKey != null && firstKey != "") {
          var tempBt;
          var x, y, z;
          tempBt = intByte;
          for (x = firstLength - 1; x >= 0; x--) {
            tempBt = dec(tempBt, firstKeyBt[x]);
          }
          decByte = tempBt;
        }
      }
    }
    decStr += byteToString(decByte);
  }
  return decStr;
}
/* 
* chang the string into the bit array 
*  
* return bit array(it's length % 64 = 0) 
*/
function getKeyBytes(key) {
  var keyBytes = new Array();
  var leng = key.length;
  var iterator = parseInt(leng / 4);
  var remainder = leng % 4;
  var i = 0;
  for (i = 0; i < iterator; i++) {
    keyBytes[i] = strToBt(key.substring(i * 4 + 0, i * 4 + 4));
  }
  if (remainder > 0) {
    keyBytes[i] = strToBt(key.substring(i * 4 + 0, leng));
  }
  return keyBytes;
}

/* 
* chang the string(it's length <= 4) into the bit array 
*  
* return bit array(it's length = 64) 
*/
function strToBt(str) {
  var leng = str.length;
  var bt = new Array(64);
  if (leng < 4) {
    var i = 0, j = 0, p = 0, q = 0;
    for (i = 0; i < leng; i++) {
      var k = str.charCodeAt(i);
      for (j = 0; j < 16; j++) {
        var pow = 1, m = 0;
        for (m = 15; m > j; m--) {
          pow *= 2;
        }
        bt[16 * i + j] = parseInt(k / pow) % 2;
      }
    }
    for (p = leng; p < 4; p++) {
      var k = 0;
      for (q = 0; q < 16; q++) {
        var pow = 1, m = 0;
        for (m = 15; m > q; m--) {
          pow *= 2;
        }
        bt[16 * p + q] = parseInt(k / pow) % 2;
      }
    }
  } else {
    for (i = 0; i < 4; i++) {
      var k = str.charCodeAt(i);
      for (j = 0; j < 16; j++) {
        var pow = 1;
        for (m = 15; m > j; m--) {
          pow *= 2;
        }
        bt[16 * i + j] = parseInt(k / pow) % 2;
      }
    }
  }
  return bt;
}

/* 
* chang the bit(it's length = 4) into the hex 
*  
* return hex 
*/
function bt4ToHex(binary) {
  var hex;
  switch (binary) {
    case "0000": hex = "0"; break;
    case "0001": hex = "1"; break;
    case "0010": hex = "2"; break;
    case "0011": hex = "3"; break;
    case "0100": hex = "4"; break;
    case "0101": hex = "5"; break;
    case "0110": hex = "6"; break;
    case "0111": hex = "7"; break;
    case "1000": hex = "8"; break;
    case "1001": hex = "9"; break;
    case "1010": hex = "A"; break;
    case "1011": hex = "B"; break;
    case "1100": hex = "C"; break;
    case "1101": hex = "D"; break;
    case "1110": hex = "E"; break;
    case "1111": hex = "F"; break;
  }
  return hex;
}

/* 
* chang the hex into the bit(it's length = 4) 
*  
* return the bit(it's length = 4) 
*/
function hexToBt4(hex) {
  var binary;
  switch (hex) {
    case "0": binary = "0000"; break;
    case "1": binary = "0001"; break;
    case "2": binary = "0010"; break;
    case "3": binary = "0011"; break;
    case "4": binary = "0100"; break;
    case "5": binary = "0101"; break;
    case "6": binary = "0110"; break;
    case "7": binary = "0111"; break;
    case "8": binary = "1000"; break;
    case "9": binary = "1001"; break;
    case "A": binary = "1010"; break;
    case "B": binary = "1011"; break;
    case "C": binary = "1100"; break;
    case "D": binary = "1101"; break;
    case "E": binary = "1110"; break;
    case "F": binary = "1111"; break;
  }
  return binary;
}

/* 
* chang the bit(it's length = 64) into the string 
*  
* return string 
*/
function byteToString(byteData) {
  var str = "";
  for (i = 0; i < 4; i++) {
    var count = 0;
    for (j = 0; j < 16; j++) {
      var pow = 1;
      for (m = 15; m > j; m--) {
        pow *= 2;
      }
      count += byteData[16 * i + j] * pow;
    }
    if (count != 0) {
      str += String.fromCharCode(count);
    }
  }
  return str;
}

function bt64ToHex(byteData) {
  var hex = "";
  for (i = 0; i < 16; i++) {
    var bt = "";
    for (j = 0; j < 4; j++) {
      bt += byteData[i * 4 + j];
    }
    hex += bt4ToHex(bt);
  }
  return hex;
}

function hexToBt64(hex) {
  var binary = "";
  for (i = 0; i < 16; i++) {
    binary += hexToBt4(hex.substring(i, i + 1));
  }
  return binary;
}

/* 
* the 64 bit des core arithmetic 
*/

function enc(dataByte, keyByte) {
  var keys = generateKeys(keyByte);
  var ipByte = initPermute(dataByte);
  var ipLeft = new Array(32);
  var ipRight = new Array(32);
  var tempLeft = new Array(32);
  var i = 0, j = 0, k = 0, m = 0, n = 0;
  for (k = 0; k < 32; k++) {
    ipLeft[k] = ipByte[k];
    ipRight[k] = ipByte[32 + k];
  }
  for (i = 0; i < 16; i++) {
    for (j = 0; j < 32; j++) {
      tempLeft[j] = ipLeft[j];
      ipLeft[j] = ipRight[j];
    }
    var key = new Array(48);
    for (m = 0; m < 48; m++) {
      key[m] = keys[i][m];
    }
    var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft);
    for (n = 0; n < 32; n++) {
      ipRight[n] = tempRight[n];
    }

  }


  var finalData = new Array(64);
  for (i = 0; i < 32; i++) {
    finalData[i] = ipRight[i];
    finalData[32 + i] = ipLeft[i];
  }
  return finallyPermute(finalData);
}

function dec(dataByte, keyByte) {
  var keys = generateKeys(keyByte);
  var ipByte = initPermute(dataByte);
  var ipLeft = new Array(32);
  var ipRight = new Array(32);
  var tempLeft = new Array(32);
  var i = 0, j = 0, k = 0, m = 0, n = 0;
  for (k = 0; k < 32; k++) {
    ipLeft[k] = ipByte[k];
    ipRight[k] = ipByte[32 + k];
  }
  for (i = 15; i >= 0; i--) {
    for (j = 0; j < 32; j++) {
      tempLeft[j] = ipLeft[j];
      ipLeft[j] = ipRight[j];
    }
    var key = new Array(48);
    for (m = 0; m < 48; m++) {
      key[m] = keys[i][m];
    }

    var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft);
    for (n = 0; n < 32; n++) {
      ipRight[n] = tempRight[n];
    }
  }


  var finalData = new Array(64);
  for (i = 0; i < 32; i++) {
    finalData[i] = ipRight[i];
    finalData[32 + i] = ipLeft[i];
  }
  return finallyPermute(finalData);
}

function initPermute(originalData) {
  var ipByte = new Array(64);
  for (i = 0, m = 1, n = 0; i < 4; i++, m += 2, n += 2) {
    for (j = 7, k = 0; j >= 0; j--, k++) {
      ipByte[i * 8 + k] = originalData[j * 8 + m];
      ipByte[i * 8 + k + 32] = originalData[j * 8 + n];
    }
  }
  return ipByte;
}

function expandPermute(rightData) {
  var epByte = new Array(48);
  for (i = 0; i < 8; i++) {
    if (i == 0) {
      epByte[i * 6 + 0] = rightData[31];
    } else {
      epByte[i * 6 + 0] = rightData[i * 4 - 1];
    }
    epByte[i * 6 + 1] = rightData[i * 4 + 0];
    epByte[i * 6 + 2] = rightData[i * 4 + 1];
    epByte[i * 6 + 3] = rightData[i * 4 + 2];
    epByte[i * 6 + 4] = rightData[i * 4 + 3];
    if (i == 7) {
      epByte[i * 6 + 5] = rightData[0];
    } else {
      epByte[i * 6 + 5] = rightData[i * 4 + 4];
    }
  }
  return epByte;
}

function xor(byteOne, byteTwo) {
  var xorByte = new Array(byteOne.length);
  for (i = 0; i < byteOne.length; i++) {
    xorByte[i] = byteOne[i] ^ byteTwo[i];
  }
  return xorByte;
}

function sBoxPermute(expandByte) {

  var sBoxByte = new Array(32);
  var binary = "";
  var s1 = [
    [14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
    [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
    [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
    [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]];

  /* Table - s2 */
  var s2 = [
    [15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
    [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
    [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
    [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]];

  /* Table - s3 */
  var s3 = [
    [10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
    [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
    [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
    [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]];
  /* Table - s4 */
  var s4 = [
    [7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
    [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
    [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
    [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]];

  /* Table - s5 */
  var s5 = [
    [2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
    [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
    [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
    [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]];

  /* Table - s6 */
  var s6 = [
    [12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
    [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
    [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
    [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]];

  /* Table - s7 */
  var s7 = [
    [4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
    [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
    [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
    [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]];

  /* Table - s8 */
  var s8 = [
    [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
    [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
    [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
    [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]];

  for (m = 0; m < 8; m++) {
    var i = 0, j = 0;
    i = expandByte[m * 6 + 0] * 2 + expandByte[m * 6 + 5];
    j = expandByte[m * 6 + 1] * 2 * 2 * 2
      + expandByte[m * 6 + 2] * 2 * 2
      + expandByte[m * 6 + 3] * 2
      + expandByte[m * 6 + 4];
    switch (m) {
      case 0:
        binary = getBoxBinary(s1[i][j]);
        break;
      case 1:
        binary = getBoxBinary(s2[i][j]);
        break;
      case 2:
        binary = getBoxBinary(s3[i][j]);
        break;
      case 3:
        binary = getBoxBinary(s4[i][j]);
        break;
      case 4:
        binary = getBoxBinary(s5[i][j]);
        break;
      case 5:
        binary = getBoxBinary(s6[i][j]);
        break;
      case 6:
        binary = getBoxBinary(s7[i][j]);
        break;
      case 7:
        binary = getBoxBinary(s8[i][j]);
        break;
    }
    sBoxByte[m * 4 + 0] = parseInt(binary.substring(0, 1));
    sBoxByte[m * 4 + 1] = parseInt(binary.substring(1, 2));
    sBoxByte[m * 4 + 2] = parseInt(binary.substring(2, 3));
    sBoxByte[m * 4 + 3] = parseInt(binary.substring(3, 4));
  }
  return sBoxByte;
}

function pPermute(sBoxByte) {
  var pBoxPermute = new Array(32);
  pBoxPermute[0] = sBoxByte[15];
  pBoxPermute[1] = sBoxByte[6];
  pBoxPermute[2] = sBoxByte[19];
  pBoxPermute[3] = sBoxByte[20];
  pBoxPermute[4] = sBoxByte[28];
  pBoxPermute[5] = sBoxByte[11];
  pBoxPermute[6] = sBoxByte[27];
  pBoxPermute[7] = sBoxByte[16];
  pBoxPermute[8] = sBoxByte[0];
  pBoxPermute[9] = sBoxByte[14];
  pBoxPermute[10] = sBoxByte[22];
  pBoxPermute[11] = sBoxByte[25];
  pBoxPermute[12] = sBoxByte[4];
  pBoxPermute[13] = sBoxByte[17];
  pBoxPermute[14] = sBoxByte[30];
  pBoxPermute[15] = sBoxByte[9];
  pBoxPermute[16] = sBoxByte[1];
  pBoxPermute[17] = sBoxByte[7];
  pBoxPermute[18] = sBoxByte[23];
  pBoxPermute[19] = sBoxByte[13];
  pBoxPermute[20] = sBoxByte[31];
  pBoxPermute[21] = sBoxByte[26];
  pBoxPermute[22] = sBoxByte[2];
  pBoxPermute[23] = sBoxByte[8];
  pBoxPermute[24] = sBoxByte[18];
  pBoxPermute[25] = sBoxByte[12];
  pBoxPermute[26] = sBoxByte[29];
  pBoxPermute[27] = sBoxByte[5];
  pBoxPermute[28] = sBoxByte[21];
  pBoxPermute[29] = sBoxByte[10];
  pBoxPermute[30] = sBoxByte[3];
  pBoxPermute[31] = sBoxByte[24];
  return pBoxPermute;
}

function finallyPermute(endByte) {
  var fpByte = new Array(64);
  fpByte[0] = endByte[39];
  fpByte[1] = endByte[7];
  fpByte[2] = endByte[47];
  fpByte[3] = endByte[15];
  fpByte[4] = endByte[55];
  fpByte[5] = endByte[23];
  fpByte[6] = endByte[63];
  fpByte[7] = endByte[31];
  fpByte[8] = endByte[38];
  fpByte[9] = endByte[6];
  fpByte[10] = endByte[46];
  fpByte[11] = endByte[14];
  fpByte[12] = endByte[54];
  fpByte[13] = endByte[22];
  fpByte[14] = endByte[62];
  fpByte[15] = endByte[30];
  fpByte[16] = endByte[37];
  fpByte[17] = endByte[5];
  fpByte[18] = endByte[45];
  fpByte[19] = endByte[13];
  fpByte[20] = endByte[53];
  fpByte[21] = endByte[21];
  fpByte[22] = endByte[61];
  fpByte[23] = endByte[29];
  fpByte[24] = endByte[36];
  fpByte[25] = endByte[4];
  fpByte[26] = endByte[44];
  fpByte[27] = endByte[12];
  fpByte[28] = endByte[52];
  fpByte[29] = endByte[20];
  fpByte[30] = endByte[60];
  fpByte[31] = endByte[28];
  fpByte[32] = endByte[35];
  fpByte[33] = endByte[3];
  fpByte[34] = endByte[43];
  fpByte[35] = endByte[11];
  fpByte[36] = endByte[51];
  fpByte[37] = endByte[19];
  fpByte[38] = endByte[59];
  fpByte[39] = endByte[27];
  fpByte[40] = endByte[34];
  fpByte[41] = endByte[2];
  fpByte[42] = endByte[42];
  fpByte[43] = endByte[10];
  fpByte[44] = endByte[50];
  fpByte[45] = endByte[18];
  fpByte[46] = endByte[58];
  fpByte[47] = endByte[26];
  fpByte[48] = endByte[33];
  fpByte[49] = endByte[1];
  fpByte[50] = endByte[41];
  fpByte[51] = endByte[9];
  fpByte[52] = endByte[49];
  fpByte[53] = endByte[17];
  fpByte[54] = endByte[57];
  fpByte[55] = endByte[25];
  fpByte[56] = endByte[32];
  fpByte[57] = endByte[0];
  fpByte[58] = endByte[40];
  fpByte[59] = endByte[8];
  fpByte[60] = endByte[48];
  fpByte[61] = endByte[16];
  fpByte[62] = endByte[56];
  fpByte[63] = endByte[24];
  return fpByte;
}

function getBoxBinary(i) {
  var binary = "";
  switch (i) {
    case 0: binary = "0000"; break;
    case 1: binary = "0001"; break;
    case 2: binary = "0010"; break;
    case 3: binary = "0011"; break;
    case 4: binary = "0100"; break;
    case 5: binary = "0101"; break;
    case 6: binary = "0110"; break;
    case 7: binary = "0111"; break;
    case 8: binary = "1000"; break;
    case 9: binary = "1001"; break;
    case 10: binary = "1010"; break;
    case 11: binary = "1011"; break;
    case 12: binary = "1100"; break;
    case 13: binary = "1101"; break;
    case 14: binary = "1110"; break;
    case 15: binary = "1111"; break;
  }
  return binary;
}
/* 
* generate 16 keys for xor 
* 
*/
function generateKeys(keyByte) {
  var key = new Array(56);
  var keys = new Array();

  keys[0] = new Array();
  keys[1] = new Array();
  keys[2] = new Array();
  keys[3] = new Array();
  keys[4] = new Array();
  keys[5] = new Array();
  keys[6] = new Array();
  keys[7] = new Array();
  keys[8] = new Array();
  keys[9] = new Array();
  keys[10] = new Array();
  keys[11] = new Array();
  keys[12] = new Array();
  keys[13] = new Array();
  keys[14] = new Array();
  keys[15] = new Array();
  var loop = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1];

  for (i = 0; i < 7; i++) {
    for (j = 0, k = 7; j < 8; j++, k--) {
      key[i * 8 + j] = keyByte[8 * k + i];
    }
  }

  var i = 0;
  for (i = 0; i < 16; i++) {
    var tempLeft = 0;
    var tempRight = 0;
    for (j = 0; j < loop[i]; j++) {
      tempLeft = key[0];
      tempRight = key[28];
      for (k = 0; k < 27; k++) {
        key[k] = key[k + 1];
        key[28 + k] = key[29 + k];
      }
      key[27] = tempLeft;
      key[55] = tempRight;
    }
    var tempKey = new Array(48);
    tempKey[0] = key[13];
    tempKey[1] = key[16];
    tempKey[2] = key[10];
    tempKey[3] = key[23];
    tempKey[4] = key[0];
    tempKey[5] = key[4];
    tempKey[6] = key[2];
    tempKey[7] = key[27];
    tempKey[8] = key[14];
    tempKey[9] = key[5];
    tempKey[10] = key[20];
    tempKey[11] = key[9];
    tempKey[12] = key[22];
    tempKey[13] = key[18];
    tempKey[14] = key[11];
    tempKey[15] = key[3];
    tempKey[16] = key[25];
    tempKey[17] = key[7];
    tempKey[18] = key[15];
    tempKey[19] = key[6];
    tempKey[20] = key[26];
    tempKey[21] = key[19];
    tempKey[22] = key[12];
    tempKey[23] = key[1];
    tempKey[24] = key[40];
    tempKey[25] = key[51];
    tempKey[26] = key[30];
    tempKey[27] = key[36];
    tempKey[28] = key[46];
    tempKey[29] = key[54];
    tempKey[30] = key[29];
    tempKey[31] = key[39];
    tempKey[32] = key[50];
    tempKey[33] = key[44];
    tempKey[34] = key[32];
    tempKey[35] = key[47];
    tempKey[36] = key[43];
    tempKey[37] = key[48];
    tempKey[38] = key[38];
    tempKey[39] = key[55];
    tempKey[40] = key[33];
    tempKey[41] = key[52];
    tempKey[42] = key[45];
    tempKey[43] = key[41];
    tempKey[44] = key[49];
    tempKey[45] = key[35];
    tempKey[46] = key[28];
    tempKey[47] = key[31];
    switch (i) {
      case 0: for (m = 0; m < 48; m++) { keys[0][m] = tempKey[m]; } break;
      case 1: for (m = 0; m < 48; m++) { keys[1][m] = tempKey[m]; } break;
      case 2: for (m = 0; m < 48; m++) { keys[2][m] = tempKey[m]; } break;
      case 3: for (m = 0; m < 48; m++) { keys[3][m] = tempKey[m]; } break;
      case 4: for (m = 0; m < 48; m++) { keys[4][m] = tempKey[m]; } break;
      case 5: for (m = 0; m < 48; m++) { keys[5][m] = tempKey[m]; } break;
      case 6: for (m = 0; m < 48; m++) { keys[6][m] = tempKey[m]; } break;
      case 7: for (m = 0; m < 48; m++) { keys[7][m] = tempKey[m]; } break;
      case 8: for (m = 0; m < 48; m++) { keys[8][m] = tempKey[m]; } break;
      case 9: for (m = 0; m < 48; m++) { keys[9][m] = tempKey[m]; } break;
      case 10: for (m = 0; m < 48; m++) { keys[10][m] = tempKey[m]; } break;
      case 11: for (m = 0; m < 48; m++) { keys[11][m] = tempKey[m]; } break;
      case 12: for (m = 0; m < 48; m++) { keys[12][m] = tempKey[m]; } break;
      case 13: for (m = 0; m < 48; m++) { keys[13][m] = tempKey[m]; } break;
      case 14: for (m = 0; m < 48; m++) { keys[14][m] = tempKey[m]; } break;
      case 15: for (m = 0; m < 48; m++) { keys[15][m] = tempKey[m]; } break;
    }
  }
  return keys;
}

// lt
// LT-2597-Wef7gmfK1QYDDtfUSPzkZauplckbPy-cas
// LT-2598-zGIfgPBgC1viRnMXp6JnucQiK9ri3b-cas
// LT-2627-2mdQZXTpXs1XtlkF6SJodXA7FZAZHv-cas
// LT-2628-45c5N2CjPYNiTzETIcLhddBmISaebD-cas
module.exports = strEnc
